Hard alloy saw blade with extrusion tooth holder

Abstract

The invention relates to a hard alloy saw blade with an extrusion tooth holder. The hard alloy saw blade comprises a base body provided with a chip containing groove and a tool bit welded to the base body. A tooth holder formed by extrusion is arranged in the chip pocket; the tool bit is brazed on the tooth holder; the welding surface of the tool bit is matched with the tooth holder; the joint of the tooth holder and the base body adopts a fillet R1 for transition; the non-welding surface of the tooth holder is provided with a pattern draft; the thickness of the tooth holder is the same as that of the tool bit; the extrusion tooth holder structure has the beneficial effects that the extrusion tooth holder structure is adopted, the width of the welding face of the tooth holder is increased, and the area of the welding face is increased essentially; the bonding strength of the base body and the tool bit is improved, and the risk that the tool bit falls off is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of carbide circular saw blades, and in particular to an extruded tooth seat carbide saw blade. Background Art

[0002] The carbide circular saw blade is composed of a circular base located inside the saw blade and a cutter head welded to the outside of the base. The base is a circular thin sheet component with uniform thickness and evenly distributed chip grooves, tooth seats, and expansion joints on the outer circle. The base supports and fixes the cutter head and transmits motion and power. The cutter heads are evenly distributed on the outside of the base and are the working components of the saw blade, directly cutting the cutting object. The cutter head is fixedly connected to the tooth seat of the base by welding; the tooth seat is set on one side of the chip groove and has an L-shaped welding surface.

[0003] Generally, the thickness of the cutter head is more than 1 mm larger than the thickness of the substrate, that is, 0.5 mm larger on one side, which is called side clearance. The function of the side clearance is to reduce the friction between the substrate and the cutting material.

[0004] During the operation of the saw blade, the blade head often falls off from the base, causing the saw blade to be scrapped. The root cause is the low welding strength between the blade head and the base. The main component of the blade head is WC, while the base is alloy steel. The chemical composition of the two is very different, and the shrinkage ratio after welding is also very different. At present, only brazing can be used. Brazing is achieved by penetration and diffusion between the interfaces of dissimilar materials. The welding strength is much lower than that of molten pool welding.

[0005] At present, the matrix processing is to use rolled steel plates to stamp or cut out chip grooves, tooth seats, and expansion joints, and then heat treat them, and finally grind the two planes flat. Before the saw blade is processed, the surface of the tooth seat is ground using special equipment to improve the dimensional accuracy of the tooth seat surface and remove the oxide scale on the surface. In this way, the metal at the tooth seat has a certain degree of structural defects and low mechanical properties. After welding with the cutter head, the structural defects of the metal here are aggravated because it can only be tempered at low temperature. If the saw blade is tempered at high temperature after welding, the hardness of the matrix will decrease, affecting the strength and rigidity of the saw blade. A considerable part of the broken saw blades do not fall off from the welding surface, but cracks appear at the tooth seat, and then break; how to improve the strength of the tooth seat is a technical problem that needs to be solved.

[0006] In the existing patent, the application number is 201921462577.9, and the name is a kind of alloy circular saw blade with scraper, which discloses a circular saw blade body, the surface of which is provided with cutting teeth, the top and bottom of which are provided with drainage grooves, the left side of the inner wall of which is provided with a mounting groove, and the scraper is provided inside the drainage groove; the saw blade fails to strengthen the tooth seat, and has the technical problem of low strength mentioned above; The application number is 202110359340.3; the name is a carbide circular saw blade, including a saw blade body and a cutter head, and tooth-like protrusions are evenly distributed on the outer edge of the saw blade body, and a cutter head seat is provided on the upper part of each tooth-like protrusion, and the side of the cutter head seat is a side end wall, and the side end wall and the cutter head are in contact in the thickness direction of the saw blade body and are arranged side by side, and the side end wall and the cutter head are fixed together by screws; the cutter head is fixed to the tooth seat of the base by screws, which reduces the strength of the tooth seat on the base, and the tooth seat is more prone to breakage. Summary of the invention

[0007] The invention of this application aims to provide a carbide saw blade with an extruded tooth seat, thereby improving the strength of the tooth seat and thereby extending the service life of the saw blade.

[0008] To achieve the above objectives, this application adopts the following technical solutions: An extruded tooth seat carbide saw blade comprises a base body provided with a chip groove and a cutter head welded on the base body; an extruded tooth seat is arranged in the chip groove; the cutter head is brazed on the tooth seat; and the welding surface of the cutter head is matched with the tooth seat.

[0009] Furthermore, the thickness of the base is T1, the thickness of the tooth seat is T, T-T1=2h; wherein h is the single-sided side clearance of the saw blade; the height of the tooth seat is δ, 1mm≤δ≤2.5mm.

[0010] Furthermore, a fillet R1 transition is adopted at the connection between the gear seat and the base; 0.1mm≤R1≤1mm.

[0011] Furthermore, the non-welding surface of the gear seat is provided with a draft angle Υ, 10°≤Υ≤30°.

[0012] Furthermore, the thickness of the tooth seat is the same as the thickness of the cutter head.

[0013] Furthermore, the tooth seat is formed by hot extrusion.

[0014] Furthermore, the base is provided with expansion joints, the expansion joints are communicated with the bottom of the chip groove, the number of the expansion joints is not less than two, and the expansion joints are evenly distributed along the circumference of the base.

[0015] The beneficial effects of this application are: This application adopts an extruded tooth seat structure to increase the width of the welding surface of the tooth seat, which essentially increases the area of ​​the welding surface. This improves the bonding strength between the substrate and the cutter head in the most direct way, effectively reducing the risk of the cutter head falling off; Due to the plastic deformation of the metal at the tooth seat caused by hot extrusion, the fiber direction of the plate rolling is improved, the anisotropy of the plate is eliminated, and the structure is refined, so that the mechanical properties of the material at the tooth seat are improved, the strength of the tooth seat is effectively improved, and the probability of cracks at the tooth seat is reduced.

[0016] Compared with other methods of increasing the welding area, the extruded tooth seat of the present application makes saw blade processing smoother. For example, if the tooth seat is set as a curved surface, it is very difficult to grind the tooth seat in actual saw blade processing and cannot be mass-produced. However, in the production of saw blades, the present application does not need to change any processing methods and processes, and directly adopts the existing processing methods and processes to achieve the purpose of improving welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 for Figure 1 Sectional view at AA; Figure 3 for Figure 1 The enlarged view of point Ⅰ; Figure 4 for Figure 3 Sectional view at CC of ; Figure 5 for Figure 2 The enlarged view of point II; Figure 6 It is a partial three-dimensional structural schematic diagram of the present application; Figure 7 is a schematic diagram of the structure of the matrix; Figure 8 for Figure 7 The enlarged view of point III; Fig. 9 for Figure 7 Cross-sectional view at BB; Fig.10 for Figure 8 Cross-sectional view at DD; Fig.11 for Fig. 9 The enlarged view of point IV; Fig.12 is a schematic diagram of a partial three-dimensional structure of the matrix; The numbers in the figure are 1-base, 11-chip groove, 12-tooth seat, 13-expansion joint, 2-cutter head. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application; the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the present application shall fall within the scope of protection of the present application; Example 1

[0019] like Figure 1 —12, An extruded tooth seat carbide saw blade comprises a base 1 provided with a chip groove 11 and a cutter head 2 welded to the base 1; an extruded tooth seat 12 is provided in the chip groove 11; the cutter head 2 is brazed to the tooth seat 12; and the welding surface of the cutter head 2 is adapted to the tooth seat 12.

[0020] like Fig.11 , 12 As shown, the thickness of the base 1 is T1, the thickness of the tooth seat 12 is T, and T-T1=2h; the single-side thickness h is determined by the side clearance of the saw blade and cannot be greater than the side clearance, otherwise it will cause greater resistance during cutting; The height of the tooth seat 12 is δ, 1mm≤δ≤2.5mm. If the δ value is too small, the tooth seat 12 is easily deformed when the cutter head 2 is welded; if the δ value is too large, the friction during cutting will be increased, the cutting efficiency will be reduced, the temperature rise of the saw blade will be serious, and the saw blade will be deformed.

[0021] Therefore, the thickness of the tooth seat 12 is preferably the same as that of the cutter head 2, and the teeth are ground at the same time on the side of the cutter head 2 to avoid the tooth seat 12 participating in the cutting and causing the saw blade to lose its sharpness.

[0022] The connection between the tooth seat 12 and the base body 1 adopts a rounded corner R1 transition; 0.1mm≤R1≤1mm. The rounded corner transition can avoid stress concentration, improve the force of the tool holder, and is also conducive to demoulding.

[0023] The base 1 is provided with an expansion joint 13 for reducing deformation of the saw blade caused by overheating during cutting. The expansion joint 13 is communicated with the bottom of the chip groove 11. The number of the expansion joints 13 is not less than two, and the expansion joints 13 are evenly distributed along the circumference of the base 1. The number of the expansion joints 13 should not affect the dynamic balance of the saw blade itself, so the expansion joints 13 are evenly distributed along the circumference of the base 1.

[0024] The expansion joint 13 can absorb the deformation of the saw blade caused by overheating during cutting, which helps to increase the life of the saw blade.

[0025] The position of the tooth seat 12 in the chip groove 11 of the base 1 should have an extrusion margin before extrusion, and the extrusion margin is equal to the volume of the boss structure after extrusion and the base volume remaining at the tooth seat 12 before extrusion.

[0026] For example, the existing substrate is 1.2 mm thick, the blade thickness is 2.2 mm, and the welding surface width is 1.2 mm; after adopting the present application, the substrate is also 1.2 mm thick, the blade thickness is 2.2 mm, and the welding surface width is 2.2 mm, and the welding area is increased by 83.3%. It can be considered that the welding strength is directly increased by 83.3%, which shows the obvious effect of the present application; Example 2

[0027] The structure of this embodiment is basically the same as that of embodiment 1. The difference is that like Fig.11 As shown, The non-welding surface of the gear seat 12 is provided with a draft angle Υ, 10°≤Υ≤30°.

[0028] Setting a reasonable draft angle is beneficial to the formation of the gear seat and prolonging the life of the mold; Example 3

[0029] The structure of this embodiment is basically the same as that of embodiment 1. The difference is that In the extrusion process of the base body processing, hot extrusion is preferably used. The gear seat 12 is formed by hot extrusion; Hot extrusion can reduce the tonnage of the equipment and is more conducive to the forming of the gear seat. Hot extrusion is preferably carried out using an automatic hot upsetting machine, and the heating method is high-frequency induction heating. High-frequency induction heating can reduce the heating area and the area affected by thermal deformation is small; the automatic hot upsetting machine can improve processing efficiency.

[0030] The above is only a preferred specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical solution and improved ideas of the present application, which should be covered by the protection scope of the present application.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. An extruded tooth holder carbide saw blade, comprising a base (1) provided with a chip groove (11) and a cutter head (2) welded to the base (1); characterized in that: An extruded tooth seat (12) is provided in the chip groove (11); the cutter head (2) is brazed on the tooth seat (12); and the welding surface of the cutter head (2) is matched with the tooth seat (12).

2. The extruded tooth holder carbide saw blade according to claim 1, characterized in that: The thickness of the base (1) is T1, the thickness of the tooth seat (12) is T, and T-T1=2h; wherein h is the single-sided side clearance of the saw blade, and the height of the tooth seat (12) is δ, 1mm≤δ≤2.5mm.

3. The extruded tooth holder carbide saw blade according to claim 2, characterized in that: The connection between the tooth seat (12) and the base body (1) adopts a rounded corner R1 transition; 0.1mm≤R1≤1mm.

4. The extruded tooth holder carbide saw blade according to claim 2, characterized in that: The non-welding surface of the gear seat (12) is provided with a draft angle Υ, 10°≤Υ≤30°.

5. The extruded tooth holder carbide saw blade according to claim 1, characterized in that: The thickness of the tooth seat (12) is the same as the thickness of the cutter head (2).

6. The extruded tooth holder carbide saw blade according to claim 1, characterized in that: The tooth seat (12) is formed by hot extrusion.

7. The extruded tooth holder carbide saw blade according to claim 1, characterized in that: The base body (1) is provided with an expansion joint (13), the expansion joint (13) being in communication with the bottom of the chip groove (11), the number of the expansion joints (13) being no less than two, and the expansion joints (13) being evenly distributed along the circumference of the base body (1).

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